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. Compare 0-, 1-, 2-, and 3-address machines by writing programs to compute

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is a 16-bit memory address, and X, Y, and Z are either 16-bit addresses or 4-bit registers. The 0-address machine uses a stack, the 1-address machine uses an accumulator, and the other two have 16 registers and instructions operating on all combinations of memory locations and registers. SUB X,Y subtracts Y from X and SUB X,Y,Z subtracts Z from Y and puts the result in X. With 8-bit opcodes and instruction lengths that are multiples of 4 bits, how many bits does each machine need to compute X?

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